Attachment for pile drivers



April 1944- w. c. COLLYER 2,345,795

ATTACHMENT FOR PILE DRIVER Filed Sept. 4. 1942 aawvw 25 22 24 I 20 Z4 I Ea E4 T 26 27 24 H l5 ATTORNEY.

Patented Apr. 4, 1944 ATTACHMENT FOR PILE. DRIVERS William Curtis. Collyer, Palo Alto, Calif., assignor to Ingcrsoll-Rand Company, New York, N. Y., a corporation of New Jersey Application September 4, 1942, Serial No. 457,275

3 Claims. (01. 61-76) This invention relates to pile driving devices, and more particularly to a pile driver of the type that constantly rests upon a pile during the driving thereof and interlockingly engages the pile to retain the pile driver and the pile in the correct operative relationship with each other.

One object of the invention is to. enable the pile. receiving portion of the driver to be readily and accurately adjusted to accommodate piles of different thickness.

Other objects will be in part obvious and in part pointed out hereinafter.

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts,

Figure 1 is an elevation, partly in section, of so much of a pile driver as will serve to illustrate the invention and a practical application thereof,

Figure 2 is a side elevation of the pile driver,

Figure 3 is a transverse view taken through Figure 1 on the line 3-3, and

Figure 4 is a perspective view of a detail.

Referring to the drawing, 20 designates, in general, a pile driver and 2| a pile upon which the pile driver is arranged. Only the front end of the cylinder 22 of the pile driver is shown and said cylinder is secured to a front head 23 by bolts 24 and contains a reciprocatory piston 25 for driving the pile 2|.

The cylinder 22 and the front head 23 are aligned with respect to each other by a sleeve 26 that extends part way into the opposed ends of each and serves as a guide for the stem 21 of an anvil block 23 that seats upon the pile 2| for transmitting the blows of the piston 25 to the pile. The anvil block is additionally guided by a bushing 29 in the front head 23 and has a pointer 38 on its front end to penetrate the end of the pile for retaining the pile driving mechanism in the correct-driving relationship therewith.

The anvil block 28 is capable of free reciprocatory movement within the bushing and in order to prevent ejection of the anvil block from the front head stop members 3|, shown as being in the forward end of the pile driver to. receive the end of the pile. 2|. and to cooperate therewith for retaining the pile driver on the pile. To these ends a pair of guide brackets 3e are arrangedon the forward. ends of the stop member if and secured to. the front head by the bolts Theguide brackets 3%. are of angular shape, each bracket having a leg 3.! that seats against a stop member 3| and a forwardly extending leg 38 at right angles thereto to. form the bounding surface for the guideway 35. The legs 31 and 38 are suitably braced by ribs 39 and, as a preferred arrangement, the legs 31'. are of such length that they will extend well beyond the outer surfaces of the stop members 3| to provide steps 40 upon which the operator may stand to press the pile driving mechanism against the work.

Inasmuch as pile drivers of the type to which the present invention pertains are used for driving piles of different thickness it is essential that the guide brackets 36 be conveniently adjustable relatively to each other to vary the width of the guideway 35. It is, moreover, desirable that such adjustments may be made quickly and with certainty so that only a minimum amount of time will be required to determine the correct positions of the brackets for a given width of the guideway and to assure that the guideway will be in substantial alignment with the anvil block. To this end the holes 4| in the guide brackets, through which the bolts 32 extend, are made of oblong shape and of suitable length to permit of a wide range of guiding positions for the guide brackets, and on the opposed surfaces of the stop members 3| and the guide brackets are groups of serrations 42 and 43 defining equally spaced ribs to engage each other in the various positions in which the guide brackets may be placed. In the assembled positions of the parts the serrations of the stop members and the guide brackets are drawn tightly into engagement with each other by the bolts 32 so that the guide brackets 36 will be anchored firmlv to the front head.

Preferably the entire front end of each stop member 3| is serrated and the ends of the serrations 42 preferably coincide with the end surfaces of the stop members 3|. The serrations on the guide brackets also extend from end to end thereof so that their ends are readily Visible and the said serrations 43 are so positioned that the innermost one of each group is located an equal distance from the guiding surface of the leg 38. Owing to this arrangement, a wide guideway 35 may be readily defined by placing the innermost serrations on the guide brackets shifted in equal degree, as indicated by the number of exposed serrations on the guide brackets, the guideway will be correctly positioned so that a pile extending into it will be in substantially true alignment with the percussive element of the pile driver. 4 l

I claim: 1

1. In a pile driver, the combination of a percussive tool having a casing and a reciproeatory driving element therein, a pair of guide brackets on the casing to define a guideway in the plane of movement of the percussive element and each guide bracket being adjustable relatively to the other bracket to vary the width of such guideway in equal degree relatively to the plane of movement of the driving element, and groups of serrations on opposed surfaces of the casing and the guide brackets extending from end to end of such surfaces to cooperate with each other and being visible at their ends for indicating the degree of adjustment of the guide brackets with respect to each other and with respect to the axis of the percussive element.

Thus, as will be readily apparent, in each instance in which the guide brackets are 2. In a pile driver, the combination of a percussive tool having a casing and a reciprocatory driving element therein, stop members on the casing extending into the opposite sides of the plane of movement of the driving element, adjustable guide means seating against the ends of the casing for defining a guideway to receive an article to be driven and hold the percussive tool in driving relationship with such article, means for securing the guide means to the easing, and serrations on opposed surfaces of the 'stop members and the guide means extending from end to end of such surfaces and interlockingly engaging each other to prevent shifting of the guide means on the casing transversely of such guideway.

terlockingly engaging each other in the diflerent positions of the guide means on the casing to prevent accidental shifting of the guide means relatively to the casing and to determine thepositions in which the guide means may be placed upon the casing, and a step portion on the guide means.

WILLIAM CURTIS COLLYER. 

